Biodegradable polymer compositions and shrink films

U.S. Patent Number: 5726220

Abstract: The present invention provides polylactic compositions effecting an excellent mold releasability upon processing and significantly improved elongation at break and impact strength without affecting the transparency. Also provided is a shrink film which decomposes under the natural environment and has excellent transparency, flexibility, shrinkability and mold releasability upon processing by applying the polylactic acid composition to a shrink film. There is provided a biodegradable polymer composition comprising 100 parts by weight of polylactic acid and 5 to 70 parts by weight of EVA. Further, a biodegradable polymer composition is provided comprising the polymer composition with one or more additives selected from the group consisting of 0.05 to 5 parts by weight of a lubricant, 1 to 50 parts by weight of plasticizer, 0.5 to 5 parts by weight of thermal stabilizer and 0.05 to 5 parts by weight of mold releasing agent. These biodegradable polymer compositions are applied to shrink films.

Inventors: Tokushige; Yuji (Ibaraki-ken, JP), Nakamura; Norio (Tokyo, JP), Tanifuji; Yoichi (Tokyo, JP), Ueda; Shuhei (Ibaraki-ken, JP)

Assignee: Shin-Etsu Chemical Co., Ltd. (Tokyo, JP)

Application Number: 08/703,994

Issued: 1998-03-10

Expired: 2006-03-10

Classes: 523/125 ; 523/124; 524/394; 525/186; 525/190; 525/415; 525/450; 525/479

Field of search: 523/124,125 525/186,190,415,450,479 524/394

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